I. Hairunisa, M. Da’i, E. R. Wikantyasning, A. R. Gilang Mahaputra, N. Normaidah, and M. F. Abu Bakar, “Validated UV-Vis Spectrophotometric Determination of Andrographolide in Herbal Nano-Preparation”, ajc, vol. 31, no. 9, pp. 1985–1988, Jul. 2019.